Heineich osteemann and axel peip



. UNITED ST TES PATENT O FICE.

HEINRICH OSTERMANN AND AXEL PRIP, on GENEVA, SWITZERLAND.

SPECIFICATION forming part of Letters Patent No. 382,827, dated May 15, 1888.

Application filed February 16, 1888. Serial No. 264,250. (No specimens.)

To all whom it may concern.-

Be it known that we, HEINRICH OSTERMANN, chemist, and AXEL PRIP, jeweler, both residing at Geneva, Switzerland, have invented a Metallic Alloy, of which the following is a specification.

Our invention relates to a non-magnetic metallic alloy to replace steel in the works of watches, and is especially intended for the different parts of watch-escapement-s. An alloy for said purpose should be ductile and malleable. Its hardness and its coeflicient of linear expansion must be as nearly as possible the same'asthat of steel.

Our alloy is principally composed of platinum to which are added in variable quantities nickel, cobalt, copper, Wolfram, and cadmium.

The coefficient of linear expansion of our alloy varies from 0.001075 to 0.00115,'and is other metals, we first melt the copper and woll'ram by subjecting shavings of thosetwo metals to a white heat. The alloy thus obtajned is then melted with the corresponding quantities of nickel and cobalt specified and with one-half of the platinum. When .these are melted, the second half of the platinum is thrown into the mass, and when the platinum quantity of cadmium. Part of the cadmium isv volatilized.

- Having thus described our invention, What we claim is- 1. An alloy composed of platinum, nickel,

.40 l is entirely melted then we add the specified copper, Wolfram, cobalt, and cadmium, for the purpose specified. v I 2. An alloy composed of platinum, siixty to seventy parts; nickel, ten to twenty parts;

copper, ten to twenty parts;.wolfram, one to t two parts; cobalt, one to two'parts, and cadmium, one to one and one-half part, substantially as described, and for the purpose specified. I i

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

HEINRICH OSTERMANN. AXEL PRIP.

Witnessess:

L. T. ADAMS, ELMER SCHNEIDER. 

